Begin waving wand (4)
I believe the answer is:
dawn
'begin' is the definition.
(dawning is a kind of begining)
'waving wand' is the wordplay.
'waving' indicates anagramming the letters (letters wave around).
'wand' is an anagram of 'DAWN'.
(Other definitions for dawn that I've seen before include "Sunrise" , "Cockcrow" , "Aurora was its goddess" , "fresh start" , "Light in East" .)